Influence of the photoperiod on the artificial rearing,Sprodoptera litura （Fabricius）

Every stage of Spodoptera litura(Fabricius) was dealt with 8 sorts of photoperiod of light to dark at 0：24, 6：18, 8：16, 10：14,12：12, 14：10, 18：6 and 24：0 under the condition of 26(±1)℃ RH 80%~85% indoors. The result showed that the photoperiod had a significantly influence on the pupate rate, the emergence rate, the survival rate and the number of laying eggs except the life-span.Spodoptera litura had the best state of growth and development at 12：12.